A few comments, but please don't react before finishing to read my entire post :)
The Goo can just have been removed from there. It's enough to have a place where you can build something.
Let's take your appartment as an example. When you clean it, with a vacuum cleaner, do you really believe that you destroy all the dust ?
On Aniro, we considered that the land was cleaned by removing the Goo that was in the Cities of Intuition and gathering it behind Magnetic Barriers to contain it there, preventing further Goo spreading, waiting to find a way to destroy the Goo.
This doesn't mean that this or these orther methods are either known or effectively consist in destroying the Goo.
Actually, at least for the Order of Ma-Duk, the Kami teached the homins how to use magic. How could them teach something they cannot use themselves ? So yes, it is reasonnable to think that it is the same kind of magic. And considering Kami can ressurect homins and teleport homins, as well as teleport themselves, they are far better at magic than homins. So homin magic being efficient against Goo, while Kami magic can't ? Doesn't seem to make sense.
Actually, I don't know for other servers, but on Aniro the tribe Goo Heads are Goo cultists believing that illumination is reached through Goo. An interpretation is that it is reached by being completely eaten by the Goo. So claiming that no homin has ever been dissolved ? If there is no lore about it especially, these assumptions about this tribe let us believe it is highly possible.
This law is supposed to have been in place after the Grand Sage Fung Tun has been corrupted by Goo during his works for the Order of Mé-Smèr (no information in the Lore, I don't know where this comes from, but it is a story told to my character by some roleplayer's character older than mine), which was an order founded by Fung Tun and working along with Karavan to make researches and experimentations with Goo.
Actually, The Company of the Eternal Tree is not a part of the Theocracy, they are just an allied tribe, so I don't think they are absolutely subject to its laws. But this is another hard point : what is the extend of the power of each nation in its supposed "land" ?
I don't think we can view nations as the lands, like today. Rather like in the early Middle Age, there were kings of Peoples, not king of Lands. They ruled over certain lands because their peoples were occupying these lands.
All this just to point that : we share a certain numbers of facts in the Lore, but the informations are so incomplete that different interpretations led to different "common knowledge". Many peoples forget that these are not knwoledge, but theories.
This is why things that are known as facts need to be clarified, here : Goo destruction. Is it something common or not for homins, at least actual homins ?
I worked on a theory about Goo, that my character develops. But there are many gaps between informations and knowledge. I know there is several facts of destruction of Goo in the Lore, it may be surprising by the way that Aniro considered that Goo cannot be destroyed, but there is no precise information about using which device, so maybe players considered this as lost knwoledge, and this "cannot" is relative to the present, not absolute, anyway, i took it as such when I joined the game, but it always disturbed me. This led me to send a first work to the event team, for information, and hoping they enjoy ^^, and to ask that those gap are filled, so that I can correct obvious nonsense, which may not be identified as obvious yet.
Zhoi (atys)
Who ? The brave Zorai peoples, obviously.a) who would build a temple and even a whole city at a Goo-infected spot with Goo-infected trees? Isn't it very clear that Goo on the tree the Kami pointed to must have been healed or destroyed before that?
The Goo can just have been removed from there. It's enough to have a place where you can build something.
b) just cutting/digging Goo out and throwing it "elsewhere" is definitely not "cleansing the land" nor is it "fighting" against the Goo. Could chieftain Cho have been a liar who baselessly promised the Kami to cleanse the land if he wasn't even able to do so? If Cho had turned out to be a liar and the Zorai as being helpless against the Goo - then would the Kamis have supported the Zorai continually from that day on and given them the mask of kinship even?
On Aniro, we considered that the land was cleaned by removing the Goo that was in the Cities of Intuition and gathering it behind Magnetic Barriers to contain it there, preventing further Goo spreading, waiting to find a way to destroy the Goo.
c) natural fire is at least one known method to destroy Goo as the Lore states: "2520: Fire brought by the Fyros rages out of control but destroys last goo hotspots." http://atys.ryzom.com/projects/puben/wiki/L_ZoraiNewBegin At the same time the Lore also states: "What do we value? - You must guard against over-exploitation and fire, and at all costs fight against the goo which the Kamis are powerless to repel." and "What are our prohibitions? - It is forbidden to spread fire over the lands. It strips the land of its wealth and leaves it sterile." Doesn't this very clearly hint at other methods to fight Goo as well than fire which is considered as dangerous?
* some homins think that if magic would work against the Goo then the Kamis would be able to destroy Goo themselves. But why should magic woven by Kamis and magic woven by homins be the exact same "kind" or phenomenon? Kamis and homins are very different creatures.
The Sage Yi Be-Pian from the company of the Eternal Tree states in the Lore: "I've seen with my own eyes a Kami being sucked up by the Goo before I could intervene. No, I tell you, it's up to us to protect them. Did you know that homins have a better resistance to the Goo than most other living creatures?" http://atys.ryzom.com/projects/puben/wiki/C_Yi_Be-Pian No homin has ever been disolved by the Goo...
additionally to that there has been a (political) ban for Zorai to research Goo on Aniro, while contrary to that on Leanon and Arispotle the Circles of the Zorai were bestowed with the duty to do research to find out how to heal Goo: "11.2. The First Circle will study and seek a cure to the Goo, the disease afflicting Atys." http://atys.ryzom.com/projects/puben/wiki/L_ZoraiGovOrg .
Also the Company of the Eternal Tree, closest guardians of the Kami, research into "their ultimate enemy", the Goo, as the Lore states: http://atys.ryzom.com/projects/puben/wiki/C_Yi_Be-Pian
I don't think we can view nations as the lands, like today. Rather like in the early Middle Age, there were kings of Peoples, not king of Lands. They ruled over certain lands because their peoples were occupying these lands.
All this just to point that : we share a certain numbers of facts in the Lore, but the informations are so incomplete that different interpretations led to different "common knowledge". Many peoples forget that these are not knwoledge, but theories.
This is why things that are known as facts need to be clarified, here : Goo destruction. Is it something common or not for homins, at least actual homins ?
I worked on a theory about Goo, that my character develops. But there are many gaps between informations and knowledge. I know there is several facts of destruction of Goo in the Lore, it may be surprising by the way that Aniro considered that Goo cannot be destroyed, but there is no precise information about using which device, so maybe players considered this as lost knwoledge, and this "cannot" is relative to the present, not absolute, anyway, i took it as such when I joined the game, but it always disturbed me. This led me to send a first work to the event team, for information, and hoping they enjoy ^^, and to ask that those gap are filled, so that I can correct obvious nonsense, which may not be identified as obvious yet.